KR100283998B1 - Arrangement unit pointer sorting device for group unit data in optical subscriber transmission device - Google Patents

Abstract

The present invention relates to a hierarchy unit pointer alignment apparatus for hierarchy unit group data in an optical subscriber transmission apparatus, and includes a reception clock generator, a pointer analyzer, a V5 extractor, a transmitter clock generator, a pointer buffer, and a transmitter pointer generator. , And a transmitting TU forming unit.

At this time, the reception clock generator generates a TU signal processing clock using a predetermined alignment signal according to the TU type signal sent from the main controller, and the pointer analyzer generates a clock for the TUG-2 data using the TU signal processing clock. After extracting each pointer, it performs a function of error checking, detection of alignment occurrence, and detection of an alarm state (AIS, LOP).

The V5 extractor extracts the V5 clock using the pointer and alignment information extracted by the pointer analyzer, and the transmit clock generator generates the pointer alignment clock and the pointer generation clock using the alignment information received from the pointer analyzer. do.

The pointer buffer unit extracts VC data for each channel of the TUG-2 data using a TU signal processing clock, a V5 clock, and a pointer alignment clock, and the transmission pointer generator generates a pointer generation clock, a predetermined SS data, and a V5 clock. A transmission TU pointer is generated using the transmission TU forming unit, and the transmission TU forming unit multiplexes the VC data output from the pointer buffer unit and the transmission TU pointer output from the transmission pointer generator to form TU data.

Description

A unit of aligning Tributary Unit pointers for Tributary Unit Group-2 data in a Fiber Loop Carrier system

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hierarchy unit pointer alignment device for hierarchy unit group data in an optical subscriber transmission device. In particular, the invention relates to an optical subscriber transmission device using a synchronous transmission method, and thus a hierarchy unit group (TUG-2) 2) an apparatus for receiving data and aligning it with a common transmission clock according to a type of Tributary Unit (TU).

1 is a basic network configuration diagram of an optical subscriber transmission apparatus, and includes a COT (10: Central Office Terminal) and an RT (11: Remote Terminal). At this time, the COT 10 is connected to each subscriber through a general switching line, a leased line, a local area network (LAN), etc., and these subscribers are connected to a general telephone subscriber or a dedicated line subscriber through the RT 11. .

The COT 10 and the RT 11 constituting the optical subscriber transmission device are connected by the optical cable 12 to perform communication with each other by light. At this time, communication by light between the COT 10 and the RT 11 is performed using a synchronous transmission method. In the synchronous transmission method, signals are multiplexed according to a synchronous multiplexing procedure and then transmitted and received.

FIG. 2 is a diagram illustrating a mapping structure of a DS-1 signal to an STM-1 signal, which is an example of a synchronous multiplexing procedure. The DS-1 signal 110 is mapped to a C-11 120 which is a container structure. When the path overhead 131 is added to the C-11 120, the virtual box 130 becomes a virtual container.

Further, when the pointer 141 indicating the position of the VC-11 is added to the VC-11 130, the unit signal 140 (TU-11) becomes a unit. Signal 150: TUG-2 is generated, with four TU-11 pointers 151 located at the front of TUG-2 150.

When seven TUG-2 (150) are collected and a path overhead is added to the foremost part, a VC-3 (160) is created. When a pointer (171) is added to the VC-3 (160), a management unit signal ( 170: AU-32 is created, three AU-32 (170) are gathered together to form a management unit group signal (180: AUG), and finally, when a section overhead is added to the AUG 180, STM -1 frame 190 is generated.

That is, the DS-1 signal input to the optical subscriber transmission apparatus is transmitted through the optical line 12 after being made into the STM-1 signal through each multiplexing process. In addition, the STM-1 signal input to the optical subscriber transmission apparatus is demultiplexed along the reverse path of the multiplexing path described above to become a DS-1 signal and then transmitted to each subscriber.

As described above, the TUG-2 signal appears in the signal flow in the optical subscriber transmission apparatus using the synchronous transmission method.

3 is a structural diagram of a lower virtual box VC and a hierarchy unit TU, FIG. 3A is a structure of a lower virtual box, and FIG. 3B is a structure of hierarchy unit group data. At this time, each lower virtual box (VC) is made by adding a low path overhead (V5) to the container structure.

In addition, one hierarchical unit data is generated by adding a pointer to a lower virtual box. Four TU-11 data or three TU-12 data constitute one TUG-2 data. Here, the pointers added to each level unit data are called V1, V2, V3, and V4, respectively.

Meanwhile, the TU data included in the above-described TUG-2 data may have different values. Therefore, in order to perform TU data unit switching in the optical subscriber transmitter, each TU data needs to be aligned to one transmission TU clock. Then, when the aligned TU data is multiplexed to form TUG-2 data again, the pointer positions of the TUG-2 data have the same form.

Accordingly, the present invention has been made to meet the above needs, and receives a Tributary Unit Group-2 (TUG-2) data, and is controlled by the main control device through a predetermined register unit, thereby providing a common transmission clock. Its purpose is to provide a device for sorting on.

In order to achieve the above object, in the optical subscriber transmission apparatus according to the present invention, the hierarchy unit pointer alignment apparatus for hierarchy unit group data receives predetermined clock signals and alignment signals, and receives a main control device through the register unit. A reception clock generator for generating a predetermined TU signal processing clock according to a TU type signal sent by the mobile station; Extracting each pointer of the TUG-2 data by using the TU type signal and a clock for processing the TU signal, and then checking an error for the pointers, detecting whether the alignment occurs according to a predetermined rule, and receiving the pointer. A pointer analyzer for performing a function of notifying the clock generator and a function of detecting an alarm state (AIS, LOP) according to a predetermined rule; A V5 extracting unit which determines a change in the position of V5 bytes and extracts a V5 clock by using the pointer and the alignment information extracted by the pointer analyzing unit; A transmission clock generation unit configured to receive predetermined clock signals and generate a predetermined pointer alignment clock and a pointer generation clock by using alignment information received from the pointer analyzer; A pointer buffer unit for extracting VC data for each channel of the TUG-2 data using the TU signal processing clock, V5 clock, pointer alignment clock, and predetermined clock signals; A transmission pointer generation unit generating a predetermined transmission TU pointer using the pointer generation clock, the SS data sent from the register unit, and the V5 clock; And a transmission TU forming unit configured to multiplex the VC data output from the pointer buffer unit and the transmission TU pointer output from the transmission pointer generation unit to form TU data.

1 is a basic network configuration of an optical subscriber transmission device,

2 is a structural diagram of mapping a DS-1 signal to an STM-1 signal as an example of a synchronous multiplexing procedure;

3 is a structural diagram of a lower virtual box VC and a hierarchy unit;

4 is a schematic diagram of the present invention;

5 is a block diagram of the present invention;

6 is a detection state diagram of a pointer value.

* Explanation of symbols for main parts of the drawings

310: main control unit (MCU) 320: register

330: TUG-2 forming unit 410: Receive clock generator

420: pointer analysis unit 430: V5 extraction unit

440: transmit clock generation unit 450: pointer buffer unit

460: transmission pointer generation unit 470: transmission TU forming unit

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

4 is a schematic diagram of a hierarchy unit pointer alignment device 400 (hereinafter referred to as a pointer alignment device) for hierarchy unit group data in the optical subscriber transmission device according to the present invention, and includes predetermined clock signals and TUG-2. Receives data, and transmits and receives a control signal to and from the register unit 320, which is in charge of a connection function with a predetermined main control unit 310, which is responsible for the overall control of the optical subscriber transmission device, Sort by TU) and output.

The sorted TU data output from the pointer aligning device 400 is formed as TUG-2 data by the predetermined TUG-2 forming unit 330 and inserted into the flow of the corresponding signal.

5 is a block diagram of the present invention, which includes a reception clock generation unit 410, a pointer analysis unit 420, a V5 extraction unit 430, a transmission clock generation unit 440, a pointer buffer unit 450, and a transmission pointer generation unit. And a transmission TU forming unit 470.

First, to briefly describe the overall operation of the pointer aligning device 400, the input TUG-2 data is divided into TU-11 payload data or TU-12 payload data arranged at a predetermined transmission clock and output. By creating and inserting a TU-11 pointer or a TU-12 pointer into the payload data, rearranged TUG-2 data is generated.

Now, each component of the pointer alignment device 400 will be described in detail.

The reception clock generator 410 receives predetermined clock signals and a alignment signal detected and output from the pointer analyzer 420, and receives the TU type signal transmitted from the main controller 310 through the register 320. Accordingly, a predetermined TU signal processing clock is generated.

In detail, the reception clock generation unit 410 receives a 6.264 MHz clock, a TUG-2 clock of 864 KHz, and a multi-frame offset clock of 2 KHz from which the pointer is gapped.

Then, a signal indicating the type of the hierarchy unit (TU) is received from the register unit 320, and accordingly, the TUG-2 clock (864 KHz) is divided into three (in the case of the TU-12 signal) or four divisions (TU). For the -11 signal, generate a TU-12 clock or a TU-11 clock.

That is, when the signal indicating the type of the TU has a logic value of '0', it is interpreted as TU-12 to extract a 288KHz clock divided into three 864KHz clocks, and when it has a logic value of '1', it is set to TU-11. The 216KHz clock is extracted by dividing the 864KHz clock into four parts. At this time, the TU-11 clock or TU-12 clock is synchronized to the 2KHz multiframe offset clock.

It also divides the clock at 864KHz into 108 to make an 8KHz clock, divides the 8KHz clock into 4 again to extract the TU pointer clocks (V1 clock, V2 clock, V3 clock, and V4 clock), and the 208KHz clock with gapping TU pointer position. And generate a 280KHz clock.

The VC clock for processing data for each channel is generated and supplied to the pointer buffer unit 450 according to the alignment signals (positive alignment signals and negative alignment signals) output from the pointer analyzer 420. .

The TU pointer analyzer 420 extracts each pointer of the input TUG-2 data using the TU type signal and the clock for processing the TU signal generated by the reception clock generator 410, and then errors the pointers. Performs a pointer status check function that checks an error, a pointer alignment generation function that detects whether a alignment occurs according to a predetermined rule, and a fault detection function by pointer analysis that detects an alarm state (AIS, LOP) according to a predetermined rule. .

In detail, the TU pointer analyzer 420 receives TUG-2 data from the outside and uses the V1 clock and the V2 clock of the TU pointer clocks generated by the reception clock generator 410 to convert the V1 byte and the V2 clock. Detect bytes. In addition, the detected V1 byte and V2 byte are analyzed to detect a new data indicator (NDF: New Data Flag), an SS bit, and a pointer value (TU-11: 0 to 103, TU-12: 0 to 139). After that, the S1 bit and the S2 bit are interpreted and the type of the TU signal is reported to the register unit 320.

The pointer status check function outputs the pointer normal status signal (NORM_PTR), NDF generation signal, and invalid pointer status signal (INV_PTR) by examining the detected new data indicator (NDF), SS bit, and pointer value. do.

At this time, the new data indicator (NDF) is ″ 110 ″, the SS bit is ″ 11 ″ for the TU-11 signal, or ″ 10 ″ for the TU-12 signal, and the pointer value is 0 for the TU-11 signal. To 103 or 0 to 139 with respect to the TU-12 signal (ie, all normal states), a pointer steady state signal NORM_PTR is output.

The NDF generation signal is generated when the new data indicator is enabled and the SS bit and pointer value are normal. The invalid pointer status signal INV_PTR is neither a normal pointer nor an NDF generation state. Occurs when neither pointer adjustment nor AIS state.

For pointer alignment function, NDF data and SS data are normal in V1 byte and V2 byte, I bit is inverted more than 3 bits, D bit is not inverted, NDF has not occurred in the previous 3 frames, and pointer adjustment operation When this does not occur, the alignment signal is output.

If the NDF data and the SS data are normal, the D bit is inverted more than 3 bits, but the I bit is not inverted, and the NDF does not occur during the previous 3 frames and the pointer adjustment operation does not occur, the sub-alignment signal is output. .

As a fault detection function by pointer analysis, the AIS (Alarm Indication Signal) and LOP (Loss Of Pointer) states are detected in accordance with the conditions shown in Table 1 below, and the main controller 310 is detected through the register unit 320. Report to

Item Justice Detection condition occurrence condition Release condition TULOP When an unqualified pointer value is received more than 8 times in a row, or when NDF = 1001 receives more than 8 times in a row Receive normal pointer value for 3 consecutive frames, or 3 consecutive consecutive NDF = 0110 detection in normal condition TUAIS Signal with ″ 1 ″ for both VC1 information and V1-V4 When all three consecutive V1 and V2 bytes are received as ″ 1 ″ Declaration within 1ms when LOP, LOMF, AIS is detected or V5 non-conforming function failure occurs (downward) If the received V1, V2 byte is NDF = 1001 or valid pointer value with normal NDF is detected 3 times consecutively, it is released within 1ms.

The V5 extracting unit 430 determines the position change of the V5 byte and extracts the V5 clock by using the pointers V1 and V2 extracted from the pointer analyzing unit 420 and the alignment information.

Specifically, the V5 extractor 430 detects whether the V1 byte and the V2 byte have been justified from the pointer interpreter 420, determine whether the V5 byte is changed, and extract the V5 clock. do. At this time, the location of V5 has a different address range according to each TU type. In the case of TU-11, the address has a value of 0-103, and in the case of TU-12, 0-139.

6 is a detection state diagram of a pointer value, and the pointer value is detected according to the state shown in FIG.

That is, if there is no change in the pointer value detected in the previous frame, the current pointer is in a pointer loss state (LOP: Loss Of Pointer), an alarm indication state (AIS), or an invalid pointer value state (invalid). Pointer Value) detects the previously detected pointer value as a new pointer value, and when the current pointer is in the new data indicator enable (NDF enable) state or has a normal pointer value for three consecutive frames, the current pointer value is replaced with the new pointer value. If the current pointer is increased or decreased, the previous pointer value is detected as the new pointer value.

In addition, when the pointer of the previous frame is increased and the pointer of the current frame is an invalid pointer state or an AIS state, the value of the previous pointer value plus 1 is detected as a new pointer value, and the pointer of the previous frame is decreased. If the pointer of the current frame in the state is an invalid pointer value state or AIS state, the value obtained by subtracting 1 from the previous pointer value is detected as a new pointer value. At this time, the invalid pointer status signal INV_PTR is received from the pointer analyzer 420.

When the previous pointer value is 0 and the current pointer is decreased, 103 is detected as a new pointer value for the TU-11 signal and 139 is detected as a new pointer value for the TU-12 signal.

If the previous pointer value is 103 or 139, and the current pointer is increased, 0 is detected as the new pointer value.

Meanwhile, the pointer value detected as described above is increased or decreased by 1 by the alignment signal sent from the pointer analyzer 420. Thus, after the alignment has occurred, the V5 position in the next frame has a value increased / decreased by one address.

At this time, the V3 byte and the next byte are interpreted as useless data when the alignment is generated, and the V3 byte is interpreted as the valid data when the positional alignment occurs. The V5 clock indicating the position of the detected V5 byte is used for the transmission V5 position extraction and the generation of the transmission pointer value.

The transmission clock generator 440 receives predetermined clock signals and generates a predetermined pointer alignment clock and a pointer generation clock by using the alignment information received from the pointer analyzer 420.

Specifically, the transmission clock generator 440 receives a TUG-2 864KHz clock, a 2KHz multiframe offset clock, and a gapped transmission 6.264KHz clock from the outside, and the SS data and the pointer from the pointer analyzer 420. A signal indicating an increment / decrement is received.

If the SS data is ″ 10 ″, the 288KHz clock is divided into three divisions of 864KHz clock for interpretation as TU-12, and if ″ 11 ″, 216KHz is divided into four divisions of 864KHz clock for interpretation as TU-11. The clock is extracted and supplied to the pointer buffer unit 450 and the transmission pointer generator 460. At this time, the generated clocks are synchronized to the 2KHz multiframe offset clock.

In addition, one of the generated 216KHz clock and 288KHz clock is selected according to the TU type, and a gapped 208KHz clock or 280KHz clock is generated and supplied to the pointer buffer unit 450 and the transmission pointer generator 460. In this case, only the pointer position is regular gapped by using the detected pointer clock.

In addition, the pointer buffer unit 450 reflects pointer decrement information or pointer increment information, which is a signal transmitted according to a result of comparing a write address and a read address, for VC processing. The clock is supplied to the pointer buffer unit 450 as a clock. This VC processing clock is used by the pointer buffer unit 450 as a read clock of VC data.

In other words, if pointer increment occurs, the next byte of V3 bytes is useless data. Therefore, the next byte of V3 bytes is either the regular gapped 208KHz clock (for TU-11) or the 280KHz clock (for TU-12). The gapped clock signal is provided to the pointer buffer unit 450 as a VC processing clock (read clock).

If pointer decrement occurs, V3 byte is valid data. Therefore, clock signal with V3 byte inserted in regular gapped 208KHz clock (TU-11) or 280KHz clock (TU-12) is processed by VC. It is provided to the pointer buffer unit 450 as a clock for use (read clock).

On the other hand, the TUG-2 clock is divided by 108 to extract the TU pointer clock of 8 KHz, and the extracted TU pointer clock is further divided by 4 to extract the V1 clock, V2 clock, V3 clock, and V4 clock. The extracted V1 clock, V2 clock, V3 clock, and V4 clock are supplied to the transmission pointer generator 460, and the V2 clock and V3 clock are also supplied to the pointer buffer 450. At this time, the V3 clock is retimed after reflecting the alignment information received from the pointer analyzer 420, and the other V1 clock, V2 clock, and V4 clock are retimed to the TUG-2 clock.

The pointer buffer unit 450 receives the TUG-2 data and extracts the payload (VC data) of each TU data by using a TU signal processing clock, a V5 clock, a pointer alignment clock, and predetermined clock signals. . To do this, the alignment information in the pointer of the input TUG-2 data is reflected in the write address, and the aligned VC data is extracted by using one transmission clock as the read clock.

Specifically, the VC of the received TUG-2 data using the VC clock generated by the reception clock generator 410 and the V5 clock and the TUG-2 clock (864 KHz) extracted by the V5 extractor 430. The alignment operation is performed by writing data to a predetermined buffer and reading data from the buffer using a single transmission clock.

At this time, the read clock that reads the VC data from the buffer in which the VC data is stored is a clock for the VC processing generated and output by the transmission clock generator 440 and reflects the alignment information detected by the pointer analyzer 420. It is a clock.

On the other hand, if the read address and the write address are in an overflow state or an underflow state, the pointer buffer unit 450 is reset and operated, and the reset signal is operated from the main controller 310. It may be sent through the register unit 320.

In addition, when the address difference is 1 by comparing the write address with the read address, the pointer increase signal or the pointer decrease signal is generated to generate alignment information. The transmission pointer generator 460 uses the V5 extractor 430. Send the received V5 clock and V5 clock used for data read.

The transmission pointer generator 460 uses a pointer generation clock such as a 216KHz clock and a 288KHz clock generated by the transmission clock generator 440, SS data sent from the register 320, and a V5 clock for transmission. A function for generating a predetermined transmission TU pointer is performed.

Specifically, the pointer value is in the range of 0 to 103 for the TU-11 signal, the SS bit is ″ 11 ″, and the pointer value is in the range of 0 to 139 for the TU-12 signal. , SS bit is ″ 10 ″. In this case, the value of the SS bit may be received through the register unit 320, and may receive and process the value detected by the pointer analyzer 420.

When the AIS and LOP states are not detected as a result of the pointer analysis in the pointer analyzing unit 420, the new data indicator (NDF) value for transmission has a normal state of " 110 ". If an abnormal state such as an AIS state or an LOP state is detected, the detection information is reported to the register unit 320, and the V1 byte and the V2 byte are filled with bits having a logical value '1'.

On the other hand, the pointer value is changed only in the following three cases.

First, if justification is required, the value of the pointer delays the start position of the VC by insignificant information where the I bit is inverted and contains the justification byte. Pointers of consecutive frames are recorded with one incremented value, and thereafter there is no increase or decrease within three frames.

Secondly, if the positional alignment is required, the value of the pointer speeds up the start of the VC by putting valid information in place of the D bit and the positional alignment byte. Pointers of consecutive frames are written with one reduced value, and thereafter there is no increase or decrease within the three frames.

Third, for the V2 byte, a pointer value is detected in accordance with the occurrence of the transmission alignment information, and this value is set as the final pointer value and inserted into the positions of the V1 byte and the V2 byte.

Finally, the transmission TU forming unit 470 multiplexes the VC data output from the pointer buffer unit 450 and the pointer output from the transmission pointer generation unit 460 to form a TU signal.

As described above, the present invention can align predetermined TUG-2 data to a predetermined transmission clock in units of TUs. That is, the TSI (Time Slot Interchange) function of the TU-11 signal or the TU-12 signal unit may be performed in the data flow in the optical subscriber transmission device.

Claims (1)

It is used in a predetermined optical subscriber transmission apparatus, receives predetermined management unit group data (TUG-2), and controls the predetermined main controller 310 for controlling the optical subscriber transmission apparatus through the predetermined register unit 320. In the apparatus for receiving and outputting the TUG-2 data by pointer alignment in units of TU, the TU type receives predetermined clock signals and alignment signals, and is transmitted by the main controller 310 through the register unit 320. A reception clock generator 410 for generating a predetermined TU signal processing clock according to the signal; Extracting each pointer of the TUG-2 data by using the TU type signal and a clock for processing the TU signal, and then checking an error for the pointers, detecting whether the alignment occurs according to a predetermined rule, and receiving the pointer. A pointer analyzer 420 for performing a function of notifying the clock generator 410 and a function of detecting an alarm state (AIS, LOP) according to a predetermined rule; A V5 extracting unit 430 for determining a position change of the V5 byte and extracting a V5 clock by using the pointer and the alignment information extracted by the pointer analyzing unit 420; A transmission clock generator 440 which receives predetermined clock signals and generates a predetermined pointer alignment clock and a pointer generation clock by using the alignment information received from the pointer analyzer 420; A pointer buffer unit 450 for extracting VC data for each channel of the TUG-2 data using the TU signal processing clock, V5 clock, pointer alignment clock, and predetermined clock signals; A transmission pointer generation unit 460 for generating a predetermined transmission TU pointer using the pointer generation clock, the SS data sent from the register unit 320, and the V5 clock; And And a transmission TU forming unit 470 for multiplexing the VC data output from the pointer buffer unit 450 and the transmission TU pointer output from the transmission pointer generation unit 460 to form TU data. A hierarchy unit pointer alignment device for hierarchy unit group data in an optical subscriber transmission apparatus.